Question

我应该从表产品中添加一个新行，其所有者为sales（sh）到product_name_us，prod_desc到product_desc_us并使用联合。

SELECT temp.*
FROM (SELECT DISTINCT CASE WHEN pd.LANGUAGE_ID = 'US' THEN 
COALESCE(TO_CHAR(pd.TRANSLATED_NAME), ' ')
                      END AS PRODUCT_NAME_US,
                      CASE WHEN pd.LANGUAGE_ID = 'US' THEN 
CONCAT(SUBSTR(pd.TRANSLATED_DESCRIPTION, 1, 30), '...')
                      END AS PRODUCT_DESC_US,
                      CASE WHEN pd.LANGUAGE_ID = 'RU' AND pd.translated_name
 IS NULL THEN COALESCE(TO_CHAR(pd.TRANSLATED_NAME), ' ')
                      END AS PRODUCT_NAME_RU,
                      CASE WHEN pd.LANGUAGE_ID = 'RU' AND 
pd.translated_description IS NULL THEN 
CONCAT(SUBSTR(pd.TRANSLATED_DESCRIPTION, 1, 30), '...')
                      END AS PRODUCT_DESC_RU,
                      CASE 
                           WHEN EXTRACT(MONTH FROM pin.WARRANTY_PERIOD) = 

'00'  THEN EXTRACT(YEAR FROM pin.WARRANTY_PERIOD) || ' years'



                      END AS "Warranty", inv.QUANTITY_ON_HAND AS IN_STOCK 

FROM PRODUCT_DESCRIPTIONS pd JOIN PRODUCT_INFORMATION pin

ON pd.PRODUCT_ID = pin.PRODUCT_ID

JOIN INVENTORIES inv

ON inv.PRODUCT_ID = pin.PRODUCT_ID) temp




WHERE temp.PRODUCT_NAME_US LIKE '%Monitor%' 

AND temp.IN_STOCK < 100

union all (select PROD_NAME,PROD_DESC from sh.products);

Answer 1

如果我理解正确，您想在第一行中添加一行作为页脚。仅当您的2个选择的列数相同时，才能使用并集

select 'field1' as a, 'field2' as b, 'field3' as c from dual
union all
select '1', '2', null from dual;

enter image description here

但是，如果要在第一个查询列中使用第二个查询列进行匹配，那是不可能的，因为它不在select语句之内

如何使用联合从另一个表添加新行？

1 个答案: